Improved screw for soles and heels of shoes



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Letters Patent N 107,143, (lated S'eptcmhcr 6, i870.

IMPROVED SCREW FOR SOLES AND'HEELS OF SHOES.

The Schedule xeferredto in these Letters Patent and making part of the same Figure 1 represents an elevation ot' a ginnici-pointed screw, with a cylindrical head.'

Figure 2 is a similar view of a screw, with a partly A (.'ylindrical and part-ly tapering head.

Figure 3 is a like view oi' a screw wit-h the ori'linury tapering head.

This invention consists in producing, as a new` article ot' manufacture, a hardened giiulel-pointed metab.

lic screw, which I term an arnwr-screw, and which is to be used for arming shoe-soles and heels to prevent rapid wear of 'the sanne.

In general construction, this armor-screw is similar to t-he ordinary gimlet-pointed wood-screw, the distinction between the two consisting mainly in the process of manufacturing them, and in niostcases also in the material made use of. Y

My armor-screw, after it has been inished in the usual manner, is subjected to a hardening process.l to

qualify it lor resisting the wear to which it will be exposed when applied as above stated, and is generally made of' steel, though it may be made of iron and at'- terward case-hardened. l

The preferable form of head for this armor-screw is shown in fig. 1, presenting a surface of uniform area until it is entirely worn oti'; but other forms ot' heads, such as shown in igs. 2 and 3, though not quite as desirable, will answer very well.

The lcngth'of its shank will be determined by the thickness of the sole to'which it is to be applied, various sizes being made' to that end.

Having thus described my invention,

What I claim, and desire to secure by Let-ters Patent, is

As a new article of manutacture, the within-de scribed hardened steel armor-screw, for shoe-solesand heels.

In testimony whereotl I have signed my name to the foregoing speeitication in the presence of two subscribing witnesses. y.

l). H. WHITNEY.

Witnesses:

W. It. LAUGHLix, EDM. F. Bnows. 

